What are the tools for describing algorithms?

Question

block diagram

The question is similar to this: What tools do you use to describe complex algorithms?
There is a big task, with a bunch of details. The customer provides the specification in parts. I decided to describe the solution algorithm, because I realized that there is a general understanding of the problem, but it is difficult to keep the full solution in my head.
I began to describe the solution and came to the conclusion that it is convenient to do it in the form of a tree structure. Those. we divide the task into subtasks, subtasks into solution steps, etc.
UML is not very convenient in terms of wasting time on drawing. I did not work with MindMap and after trying a couple of applications I realized that it was not convenient. I tried to search for a tree-like notepad, but the results with an interface from the 90s are depressing.
While I am writing in sublime text using tabs and folding, but there are very few links (i.e. I describe something in one place and link to it in another), color highlighting, etc.
Can someone suggest a convenient tree editor?

Answer 1

Everything is simple